function ret=Gl_in_Seps(epsilon,Gl)
 I=eye(2);
 ret={};
 for g = Gl
  g=g{1};
  U=I;
  for u = g
   u=u{1};
   U=U*u;
  endfor
  if(distance(U,I)<epsilon)
   ret{end+1}=U;
  endif 
 endfor
endfunction
